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SQL to MongoDB Mapping Chart¶
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In addition to the charts that follow, you might want to consider the Frequently Asked Questions section for a selection of common questions about MongoDB.
Terminology and Concepts¶
The following table presents the various SQL terminology and concepts and the corresponding MongoDB terminology and concepts.
SQL Terms/Concepts | MongoDB Terms/Concepts |
---|---|
database | database |
table | collection |
row | document or BSON document |
column | field |
index | index |
table joins | embedded documents and linking |
primary key Specify any unique column or column combination as primary key. |
In MongoDB, the primary key is automatically set to the _id field. |
aggregation (e.g. group by) | aggregation pipeline See the SQL to Aggregation Mapping Chart. |
Executables¶
The following table presents the MySQL/Oracle executables and the corresponding MongoDB executables.
MongoDB | MySQL | Oracle | Informix | DB2 | |
---|---|---|---|---|---|
Database Server | mongod |
mysqld |
oracle |
IDS |
DB2 Server |
Database Client | mongo |
mysql |
sqlplus |
DB-Access |
DB2 Client |
Examples¶
The following table presents the various SQL statements and the corresponding MongoDB statements. The examples in the table assume the following conditions:
The SQL examples assume a table named
users
.The MongoDB examples assume a collection named
users
that contain documents of the following prototype:
Create and Alter¶
The following table presents the various SQL statements related to table-level actions and the corresponding MongoDB statements.
SQL Schema Statements | MongoDB Schema Statements |
---|---|
Implicitly created on first However, you can also explicitly create a collection: |
|
Collections do not describe or enforce the structure of its documents; i.e. there is no structural alteration at the collection level. However, at the document level, |
|
Collections do not describe or enforce the structure of its documents; i.e. there is no structural alteration at the collection level. However, at the document level, |
|
For more information on the methods and operators used, see:
See also
Insert¶
The following table presents the various SQL statements related to inserting records into tables and the corresponding MongoDB statements.
SQL INSERT Statements | MongoDB insert() Statements |
---|---|
For more information, see db.collection.insert()
.
See also
Select¶
The following table presents the various SQL statements related to reading records from tables and the corresponding MongoDB statements.
Note
The find()
method always includes the _id
field in the returned documents unless specifically excluded through
projection. Some of the SQL queries below may include an
_id
field to reflect this, even if the field is not included in the
corresponding find()
query.
SQL SELECT Statements | MongoDB find() Statements |
---|---|
or |
|
or |
|
or |
|
or |
|
For more information on the methods and operators used, see
Update Records¶
The following table presents the various SQL statements related to updating existing records in tables and the corresponding MongoDB statements.
SQL Update Statements | MongoDB update() Statements |
---|---|
For more information on the method and operators used in the examples, see:
See also
Delete Records¶
The following table presents the various SQL statements related to deleting records from tables and the corresponding MongoDB statements.
SQL Delete Statements | MongoDB remove() Statements |
---|---|
For more information, see db.collection.remove()
.
See also